Percutaneous coronary intervention in Asians--are there differences in clinical outcome?

• Published in: BMC cardiovascular disorders Vol. 11; no. 1; p. 22
• Main Authors: Koh, Angela S, Khin, Lay W, Choi, Lok M, Sim, Ling L, Chua, Terrance S, Koh, Tian H, Tan, Jack W, Chia, Stanley
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 23.05.2011; BioMed Central; BMC
• Subjects: Aged; Angioplasty, Balloon, Coronary - adverse effects; Angioplasty, Balloon, Coronary - mortality; Asian Continental Ancestry Group - statistics & numerical data; Care and treatment; Chi-Square Distribution; China - ethnology; Coronary artery bypass; Coronary Disease - ethnology; Coronary Disease - mortality; Coronary Disease - therapy; Coronary heart disease; Diagnosis; Female; Health aspects; Humans; India - ethnology; Logistic Models; Malaysia - ethnology; Male; Middle Aged; Myocardial Infarction - ethnology; Myocardial Infarction - etiology; Odds Ratio; Patient outcomes; Prospective Studies; Registries; Risk Assessment; Risk Factors; Singapore - epidemiology; Time Factors; Transluminal angioplasty; Treatment Outcome; Malaysia; Singapore; China; India
• ISSN: 1471-2261; 1471-2261
• DOI: 10.1186/1471-2261-11-22

Ethnic differences in clinical outcome after percutaneous coronary intervention (PCI) have been reported. Data within different Asian subpopulations is scarce. We aim to explore the differences in clinical profile and outcome between Chinese, Malay and Indian Asian patients who undergo PCI for coronary artery disease (CAD). A prospective registry of consecutive patients undergoing PCI from January 2002 to December 2007 at a tertiary care center was analyzed. Primary endpoint was major adverse cardiovascular events (MACE) of myocardial infarction (MI), repeat revascularization and all-cause death at six months. 7889 patients underwent PCI; 7544 (96%) patients completed follow-up and were included in the analysis (79% males with mean age of 59 years ± 11). There were 5130 (68%) Chinese, 1056 (14%) Malays and 1001 (13.3%) Indian patients. The remaining 357 (4.7%) patients from other minority ethnic groups were excluded from the analysis. The primary end-point occurred in 684 (9.1%) patients at six months. Indians had the highest rates of six month MACE compared to Chinese and Malays (Indians 12% vs. Chinese 8.2% vs. Malays 10.7%; OR 1.55 95%CI 1.24-1.93, p < 0.001). This was contributed by increased rates of MI (Indians 1.9% vs. Chinese 0.9% vs. Malays 1.3%; OR 4.49 95%CI 1.91-10.56 p = 0.001), repeat revascularization (Indians 6.5% vs. Chinese 4.1% vs. Malays 5.1%; OR 1.64 95%CI 1.22-2.21 p = 0.0012) and death (Indians 11.4% vs. Chinese 7.6% vs. Malays 9.9%; OR 1.65 95%CI 1.23-2.20 p = 0.001) amongst Indian patients. These data indicate that ethnic variations in clinical outcome exist following PCI. In particular, Indian patients have higher six month event rates compared to Chinese and Malays. Future studies are warranted to elucidate the underlying mechanisms behind these variations.